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https://issues.apache.org/jira/browse/NUTCH-2518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422736#comment-16422736
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ASF GitHub Bot commented on NUTCH-2518:
---------------------------------------
sebastian-nagel commented on a change in pull request #307: NUTCH-2518 Cleaning
up the file system after a job failure.
URL: https://github.com/apache/nutch/pull/307#discussion_r178584773
##########
File path: src/java/org/apache/nutch/crawl/Generator.java
##########
@@ -838,12 +846,21 @@ public Generator(Configuration conf) {
job.setOutputValueClass(CrawlDatum.class);
FileOutputFormat.setOutputPath(job, tempDir2);
try {
- int complete = job.waitForCompletion(true)?0:1;
+ boolean success = job.waitForCompletion(true);
+ if (!success) {
+ String message = "Generator job did not succeed, job status:"
+ + job.getStatus().getState() + ", reason: "
+ + job.getStatus().getFailureInfo();
+ LOG.error(message);
+ NutchJob.cleanupAfterFailure(tempDir, lock, fs);
+ NutchJob.cleanupAfterFailure(tempDir2, lock, fs);
Review comment:
ok, it's not an error to try to remove the lock file a second time.
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> Must check return value of job.waitForCompletion()
> --------------------------------------------------
>
> Key: NUTCH-2518
> URL: https://issues.apache.org/jira/browse/NUTCH-2518
> Project: Nutch
> Issue Type: Bug
> Components: crawldb, fetcher, generator, hostdb, linkdb
> Affects Versions: 1.15
> Reporter: Sebastian Nagel
> Assignee: Kenneth McFarland
> Priority: Blocker
> Fix For: 1.15
>
>
> The return value of job.waitForCompletion() of the new MapReduce API
> (NUTCH-2375) must always be checked. If it's not true, the job has been
> failed or killed. Accordingly, the program
> - should not proceed with further jobs/steps
> - must clean-up temporary data, unlock CrawlDB, etc.
> - exit with non-zero exit value, so that scripts running the crawl workflow
> can handle the failure
> Cf. NUTCH-2076, NUTCH-2442, [NUTCH-2375 PR
> #221|https://github.com/apache/nutch/pull/221#issuecomment-332941883].
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